Potential technical limitations aside (I am not too knowledgeable about this and whether or not it would cause lag), I support this. This is a great idea and would add to the amount of clever traps and other redstone mechanisms there are in the game.
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To those of you suggesting new uses for Emeralds in the suggestions forum: Emeralds have enough uses. You can trade with villagers to get diamond armor/tools/weapons and enchants. Stop suggesting that Emeralds are useless, and learn to play Minecraft. Thanks.
First off, this is a very innovative and original idea, and I for one love it!
100% Support from me!
Secondly, I am working on a mod, and was wondering if I could help you make this a real thing, even if it isn't in Vanilla Minecraft! Credit will go to you for it, and I hope we can work with you and your brilliant mind in the future!